<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
       <!-- 添加角色按钮区域 -->
        <el-row>
           <el-col>
              <el-button type='primary' @click="showAddCateDialog">添加分类</el-button>
           </el-col>
        </el-row>
        <!-- 表格 -->
        <tree-table
           :data='catelist'
           :columns='columns'
           :selection-type='false'
           :expand-type='false'
            show-index
            index-text="#"
            border
           :show-row-hover='false'
            class="treeTable">
           <!-- 是否有效 -->
           <template slot="isok" slot-scope='scope'>
              <i class="el-icon-success" style="color: lightgreen" v-if='scope.row.cat_deleted === false'></i>
              <i class="el-icon-error" style="color: red" v-else></i>
           </template>
           <!-- 排序 -->
           <template slot="order" slot-scope="scope">
              <el-tag size='mini' v-if='scope.row.cat_level === 0'>一级</el-tag>
              <el-tag type='success' size='mini' v-else-if="scope.row.cat_level === 1">二级</el-tag>
              <el-tag type='warning' size='mini' v-else>三级</el-tag>
           </template>
           <!-- 操作 -->
           <template slot="opt" slot-scope>
              <el-button type='primary' icon='el-icon-edit' size='mini'>编辑</el-button>
              <el-button type='danger' icon='el-icon-delete' size='mini'>删除</el-button>
           </template>
        </tree-table>
        <!-- 分页 -->
        <el-pagination
           @size-change="handleSizeChange"
           @current-change="handleCurrentChange"
           :current-page="querInfo.pagenum"
           :page-sizes="[3, 5, 10, 15]"
           :page-size="querInfo.pagesize"
           layout="total, sizes, prev, pager, next, jumper"
           :total="total">
        </el-pagination>
    </el-card>
    <!-- 添加分类的对话框 -->
    <el-dialog
        title="添加分类"
       :visible.sync="addCateDialogVisible"
        width="50%"
        @close='addCateDialogClosed'>
        <el-form :model='addCateForm' :rules='addCateFormRules' ref='addCateFormRef' label-width='100px'>
          <el-form-item label="分类名称:" prop='cat_name'>
             <el-input v-model="addCateForm.cat_name"></el-input>
          </el-form-item>
          <el-form-item label="父级分类:">
             <el-cascader
                expand-trigger="hover"
               :options="parentCateList"
               :props='cascaderProps'
                v-model="selectedKeys"
               @change="parentCateChanged"
                clearable>
             </el-cascader>
          </el-form-item>
        </el-form>
       <span slot="footer" class="dialog-footer">
         <el-button @click="addCateDialogVisible = false">取 消</el-button>
         <el-button type="primary" @click="addCate">确 定</el-button>
       </span>
     </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 查询条件
      querInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      // 商品分类的数据列表，默认为空
      catelist: [],
      // 总数据条数
      total: 0,
      // 为table指定列的定义
      columns: [
        { lable: '分类名称', prop: 'cat_name' },
        { lable: '是否有效', type: 'template', template: 'isok' },
        { lable: '排序', type: 'template', template: 'order' },
        { lable: '操作', type: 'template', template: 'opt' }
      ],
      addCateDialogVisible: false,
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        cat_level: 0
      },
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      },
      parentCateList: [],
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      selectedKeys: []
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取商品分类数据
    async getCateList () {
      const { data: res } = await this.$http.get('categories', { params: this.querInfo })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      this.catelist = res.data.result
      this.total = res.data.total
    },
    // 监听pagesize改变
    handleSizeChange (newSize) {
      this.querInfo.pagesize = newSize
      this.getCateList()
    },
    handleCurrentChange (newPage) {
      this.querInfo.pagenum = newPage
      this.getCateList()
    },
    // 点击按钮显示对话框
    showAddCateDialog () {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    // 获取父级分类的数据列表
    async getParentCateList () {
      const { data: res } = await this.$http.get('categories', { params: { type: 2 } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类失败')
      }
      this.parentCateList = res.data
    },
    // 选择项发生变化触发这个函数
    parentCateChanged () {
      console.log(this.selectedKeys)
      if (this.selectedKeys.length) {
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cat_level = this.selectedKeys.length
        return
      } else {
          this.addCateForm.cat_pid = 0
          this.addCateForm.cat_level = 0
      }
    },
    addCate () {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类失败')
        }
        this.$message.success('添加分类成功')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    },
    // 监听对话框的关闭事件，重置表单数据
    addCateDialogClosed () {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    }
  }
}
</script>

<style scoped>
.treeTable {
  margin: 15px;
}

.el-cascader {
  width: 100%;
}
</style>
